Git commits in Moodle 3.4.6 by Dmitrii Metelkin

commit ef0688bf35ed214e555e7dddd6996ecbdec2c39d
Author: Dmitrii Metelkin <dmitriim@catalyst-au.net>
Date:   Wed, 03 Oct 2018 08:13:02 +0800
Tag:    v3.4.6

MDL-51969 mod_lti: Fixed missing tool proxy GUID